The control process consists of sub-groups of three random samples

Published by Brilliant Ravens

The control process consists of sub-groups of three random samples. The accompanying table (and data file) gives 25 groups of samples. Create appropriate charts and discuss whether the process is out of control.

Group	x₁	x₂	x₃
1	62	70	65
2	80	76	60
3	82	75	65
4	70	74	50
5	92	81	90
6	56	75	60
7	67	62	60
8	88	77	70
9	67	73	70
10	96	87.5	93
11	81	78	84
12	82	87.5	70
13	91	84.5	97
14	75	84	80
15	76	71	65
16	93	84.5	97
17	82	69	73
18	96	87	98
19	94	65	86
20	62	79.5	90
21	69	60	50
22	82	70	60
23	85	78	95
24	68	71	85
25	83	84	85

The control process consists of sub-groups of three random samples

The control process consists of sub-groups of three random samples

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